GMC 1994 Yukon Owner's Manual page 158

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Then, press and hold the SCAN button until the correct minute appears
After you set the time, the word SET will remain in the electronic
on the display.
display for a few seconds.
Cassette Deck with Graphic Equalizer
-
If you have a cassette deck, it is built to work best with tapes that are 30 to
45 minutes long on each side. Tapes longer than that are so
thin that they
may not work well in this player.
Press the PWR button on the radio to turn the system on. The radio will
play until a cassette is pushed into the cassette entry door (the tape side goes
in first.)
Once the tape is playing, use the radio control buttons for volume, balance
and fade, just as you do for the radio. The arrows on the player indicate
which side of the tape is being played.
Graphic Equalizer
The graphic equalizer lets you fine tune bass, mid-range and treble
frequencies to your individual taste. The unit has five separate adjustable
frequency ranges.
To emphasize a frequency, press the top of the button
"+"
and to
de-emphasize a frequency, press the bottom of the button "-." It's best to
begin
with
all the controls in the middle position, then adjust each control as
you like. Observe the electronic display for relative frequency emphasis.
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